Hydraulic motor



Sept. 6, 1938.

' T. sExFER HYDRAULIC MOTOR Filed oct. 19,1937

5 Sheets-Sheet 1l /nvent a/ Attorney Sept. 6, 1938. T. sElFER HYDRAULIC MOTOR Filed oct. 19, 195':

s sheets-sheet 2 T; sen-ER 2,129,104

HYDRAULIQMOTOR Filed oct. 19,l 1957 's sheets-sheet 5 Sept. 6, 1938.

D which owing to their sensitiveness might r, vertical cross-#section and Patented sept. s, i938 HYDRAULIC Molil Theo Seifer, Berlin, Germany Application October 19, 1937, Serial. lilo. ltiltlll i In Germany October 29, mit@ 8 Claims.

cated upwards and downwards on a piston carried lthe motor being controlled by e. by control members operated by with regard to by the tubing valve iniiuenced the displacement of the cylinder the stationary piston.

Motors of this kind are known by which a good impact action can be obtained. However the life of the control members is very short because they are exposed to mechanical wear,'caused by the stones contained in the ushing water. and on the other hand to chemical corrosion owing to the caustic character oi the ushing water in case of its penetrating caustic layers.

-The object of the invention is to considerably increase the life of these control members by disposing them in a separate chamber which is tightly closed against the entrance ot ushing water and may be filled with air or a liquid oi any consistency. It desired, the pressure in the chamber may be lower than that oi the atmospheric air. Preferably the chamber may be nlled, wholly or partially with a lubricant as oil or iat.

By protecting the control members according to the invention against the iniiuence oi the flushing water I am also able to employ very sure and advantageously working Vcontrol members not be usecl'in the ushing water.

The invention is illustrated in the annexed drawings showing three modifications oi especielly advantageous control members.

Figs. l tot show .a modication axial displacement is locked in the end position'by resilient ring segments. Figs. l. and 2 are vertical cross-sections of the device in dierent positions; Figs. 3 and 3l show, in plan view and in vertical crosssection respectively, a detail. In the modification represented by Figs. 4, 5 and 5n the valve rod is locked by a resilient ball-ring, Fig. 4 beingr a vertical cross-sectional view, and Figs. 5 and 5 a in which the respectively.

Figs. 6, 'I and 'il show a modiiication similar to that illustrated in Figs. 1 and.2 in which the axial displacement oi the valve is locked by spring rings. Fig. 6 is a verticalcross-section, Fig. '1 a detail, partly in vertical cross-section and Fig. 'l a plan view.

Fig. V8 isan elevation, section showing a totalview ot its accessories.

partly in vertical crossthe motor and the upper conical beneath the collar sinlrs clown and the spring il is of the valve or the valve rod a plan view oi a detail Y (Cit. 25M) Referring now to Fig. l, i is the tubing carrying the piston 2, on which the cylinder slides up wards or downwards. e piston 2 is made hollow to form a valve chem er l in. which the valve il is located.. The side wells et the chamber are clowords continued to tor-'rn e. tube l oi somewhat smaller diameter then the cylinder t. The tube l is closed at its end by e. screw pluglc and on this is screwed a. tube "l which again is closed by e. screw plug lb. The plugs 'lo and. 'lli have axial bores provided 'with sturng boxes t. t through which e rod il is passed which transters the motion of the cylinder to valve t.

. The tube ."l enclosfesI the control members thereby valve rod is provided witha collar it forming at its upper and its lower side irustums of cones. These conical surfaces oooperstevlith ring segments il touching with conical outer faces the conical inner ieces of the ring l2 resting on the spring i3. ln the position shown in 2 the cylinder l occupies its lov/est position andthe valve is closed. "libe 'ring segments il lle on surface oi" the collar l@ thus locking the same. illl'hen water enters the cylinder through the openings lll in the tubing the cylinder is lifted and the spring is compressed.

' As soon as thiscompression suces to shirt the ring segments li outwards, the control red t slides upwardskvvhereby the valve is opened.

The ring segments il hereby ottoin position lil so that the opened valve is loclred. New the water ilotvs ori, the vcyiimlcr releeseol again. As soon as the compression oi the spring i3 is released to such en extent that the hydraulic pressure acting upon the valve together with the spring l@ displaces the valve rod il against the resistance oi the ring scontento` l l downwards;

the valve Fl ls closed and the cylinder is againl lifted.

in the modification shown in Figs. 5 vand 53 the collar it ol the valve rod does not eooperete with ring segments il, but with balls il heid in operative position with regard to the collar by a spring ring it. This modification further difiere from that shown in Figs. l to 3 by the fact that here at 4rst. an auxiliary valve I9 is actuated by the -valve rod 8 whereupon by .the variation of the hydraulic pressure conditions the main valve 5 is opened, and a further diiierence consists therein that a pin or bolt 20 is inserted between y the spring '9 acting toopen the valve, and the Y cylinder 3 whereby the stroke ofthe valve can be regulated and the duration ofthe rigid connection between the control members may be reduced to a small fraction of a second.

When in this modification the flushing water enters through the slots I4, the cylinder 3 and the rod 2i are lifted until the collar 35 fixed on the rod 2l lifts the box 22 and therewith the pin until the head of the pin 20 touches the valve rod 8. On further lifting the cylinder 3, the pin 20 slides downwards through the plate 23 thereby compressing the spring 9. As soon as the head of the pin 20 strikes upon the sleeve 24 serving for regulating the stroke of the valve. a rigid connection between the control members is established, and then thc cylinder 3 will displace the valve rod 8 upwards through the resilient balls I1. As soon as the utmost tension of the ring I8 has been reached and surpassed, the spring can recover its activity and now the rigid connection is released again. The balls roll along the upper cone of the collar III whereby the auxiliary valve I 9 is opened, whereas the balls Il under the action of the spring ring I8 are pressed be neath the collar against the valve rod and lock the latter.

When the flushing water flows oiI through the slots 25 after the auxiliary valve I9 is opened, the diiierence of pressure above and below the main valve 5 is done away with so that this valve slides downwards by its own weight and allows the water contained in the cylinder to flow on through the slots 26. Now the cylinder 3 again drops down, the valve rod 8 is taken along downwards, the plate 21 of the box 22 again striking upon the nuts 28. Now the control members are again rigidly connected with one another and the valve rod 8 is simultaneously pulled downwards overcoming the resistance of the ring I8 and again closing and locking the auxiliary valve I9. Now the water beneath the main valve 5 is arrested and. as the cross-section of the valve piston is greater than that of the valve seat, the main valve is closed. The ilushing water thereupon enters through the slots I4 and lifts the cylinder anew.

The modiiication illustrated in Pigs. 6, 'I and 7* differs from that in Figs. 1 and 2 merely as regards the collar of the control rod and the locking means coacting with this collar. f

The diameter of the control rod 8 is, in the casing conilned .by the parts la, l' and 1b, increased to such an extent that a piston forms which is provided at its circumference with conical faces 29. On these faces slide spring rings 80 having interior conical faces and being inserted between rings 3|, 3i. The rings 8| are secured to the parts 'la or 1b respectively. The head 32 of the valve rod is connected with the lower end of the valve 5 in such a manner that a small play is provided between the ends facing each other. In the upper and inthe lower ring 3| holes 33 are bored through which oil is circulated. When the .piston of the rod 8 reaches its end positions. the holes are closed and an impact of metal against metal is prevented.

When the cylinder 3 slides upwards, also the box u is lifted and the spring 9 is compressed, until the valve rod 8 is pressed upwards and the slanting surfaces 28 are shifted through the rings 30, whereby the valve 5 is opened. When the conical surfaces 29 and 3B have been displaced with respect to each other to such an extent that both slanting surfaces of a single inner ring touch one slanting surface of each of the adjacent outer rings, the compression of the spring 9 is con- -a cylinder slidably enclosing the sumed to such an extent that the rings can no longer be displaced and the valve 5 is locked in open position. While the water flows oir through the-opened valve the cylinder 3 sinks down and therewith the box 34, so that they valve rod 8 is drawn downwards by the box 34 with the nut 28 and the conical surfaces 29 are again shifted downwards through the resilient outer rings Il, whereby the valve is closed.

' I claim 1. In a hydraulic motor operated by means oi' a flushing liquid in a well, the combination oi a hollow shaft, a piston connected with said shaft, a cylinder slidably enclosing the piston, a chisel carried by said cylinder, the piston being provided with an opening, a valve adapted to. close said opening and to reverse the movement of the cylinder, members arranged between the cylinder and the piston controlling the valve, a casing secured to the piston enclosing the said members, and means within the said casing for locking the said members in their end positions.

2. In a hydraulic motor operated by means of a flushing liquid in a well. the combination of a hollow shaft, a piston connected with said shaft. a cylinder siidably enclosing the piston, a chisel carried by said cylinder, the piston being provided with an opening, a valve adapted to close said opening and to reverse the movement of the cylinder, members arranged between the cylinder andy the' piston controlling the valve, a spring adapted to open the valve, a casing secured to the piston enclosing the said members and the said spring, and means within the said casing for locking the sazi members in their end positions.

3. In a hydraulic motor operated by means of a flushing liquid in a well. the combination of a hollow shaft. a piston connected with said shaft. a cylinder slidably enclomng the piston, a chisel canied by said cylinder, the piston being provided with an opening, a valve adapted to close said opening and to reverse the movement o! the cylinder, members arranged between the cylinder and the piston controlling the valve, Va casing secured to the piston enclosing the said memcasing for locking the said members in their end pomtions.

4. In a hydraulic motor operated by means of a flushing liquid in a well, the combination of a hollow shaft. a piston connected with said shaft, a cylinder slidably enclosing the piston, a chisel carried by said cylinder. the piston being provided with an opening, a valve adapted to close said opening and to reverse the movement of the cylinder, members arranged between the cylinder and the piston controlling the valve. a spring adapted to open the valve, a. casing secured to the piston enclosing the said members and the said spring. a lubricant in the said casing, and means within the said casing for in their end positions. operated by means o! a flushing liquid in a well. the combination oi.' a hollow shaft, a piston connected with said shaft,

upper and its lower end. ring segments arranged surrounding the said collar tapered at their inner and outer surface, a conical ring carrying the said segments, a spring carrying the said conical ring, and a spring tending to open the valve inserted between the said valve rod and the cylinder,

6. In a hydraulic motor operated by means of a ilushing liquid in a well, the combination of a hollow shaft, a piston connected with said shaft, a cylinder slidably enclosing thepiston, a chisel carried by said cylinder, the piston being provided with an opening, said opening and to reverse the cylinder, a casing secured to the piston, a valve rod sliding in the said`casing and provided at its portion in the casing'with a collar .tapered at its upper and its lower end, a, row lof balls arranged to surround the said collar, a spring ring pressing the said balls in a certain position against the valve rod and in another position against the said collar, a spring inserted between the valve and the cylinder tending to open the valve, and a bolt slidably arranged with regard to the cylinder and acted upon by the last-named spring.

'7. In a hydraulic motor operated by means of a flushing liquid in a. well, the combination of a hollow shaft, a piston connected with said shaft,y

a. cylinder slidably enclosing the piston, a chisel carried by said cylinder, the piston being provided with an opening, a Valve adapted to close said opening and to reverse'the movement of the ,the valve rod and in a valve adapted to close f the movement of and an cylinder, av casing secured to the piston, a valve rod sliding in the said casing and provided at its portion in the casing with a collar tapered at its upper and its lower end, a row of balls arranged to surround the said collar, a spring ring pressing the said balls in a certain position against another position againstv the said collar, a Aspring inserted between the valve and the cylinder tending to open the valve, a bolt slidably arranged with regard to the cylinder and acted upon by the last-named spring, exchangeable sleeve determining the stroke of the valve in which sleeve the said bolt slides. 8. In a hydraulic motor operatedby means of a, flushing liquid in a well, the combination of a hollow shaft, a. piston connected. with said shaft, a cylinder slidably enclosing the piston, a chisel carried by said cylinder, the piston being provided with an opening, a valve adapted to close said opening and to reverse the movement of the cylinder, a casing secured to' the piston, a valve rod sliding in the said casing and provided, at its portion sliding inside the casing, with a piston the surface of which forms a number of cones, a number of spring rings having conical inner surfaces coacting with the said cones, and a spring inserted between the ,said valve rod and the cylinder tending to open the valve.

THEO SEIFER.. 

